JP2001292544A - Stator of commutator motor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve cooling and radiating of a stator coil by increasing the cooling and radiating surface of the stator coil. SOLUTION: At least one of the ends 2a of a coil, that is wound in the slots in a stator core 1 and is protruded from both ends of the stator core 1 in a bundle, is divided into at least two in the radial direction, and a space 5, through which cooling air, is passed is formed between the divided coil ends 2a.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a stator of a commutator motor which can cool a fixed coil efficiently.

[0002]

2. Description of the Related Art As is well known, the stator of a commutator motor shown in FIGS. 5 and 6 includes a stator core 1 and a stator coil 2 wound in a slot of the stator core 1. The stator coil 2 has a coil end portion 2a that protrudes axially outward from both ends in the axial direction of the stator core 1, and is connected to a power supply (not shown) through four lead wires 3; Is supplied with electricity.

[0003] The stator coil 2 generates heat during operation of the motor and rises in temperature. For this reason, it is common to provide a cooling fan (not shown) and cool the coil end portion 2a by cooling air. Therefore, the sectional shape of the coil bundle 2b of the coil end portion 2a is formed into a rectangle having a large surface area. The cooling effect has been enhanced by increasing the cooling surface area.

[0004]

However, for example, the surface area of the conventional coil bundle 2b having a shape in which the ratio of the sectional dimension of the coil bundle 2b in the circumferential direction (vertical) to the axial direction (horizontal) is 1: 1 is defined as the sectional area. In order to form a rectangular shape long in the axial direction so that the surface area becomes 1.5 times or more by making the same, the axial dimension of the coil bundle 2b must be extended to about 2.6 times or more.
Extending the shape of the coil bundle 2b in the axial direction or the radial direction to increase the surface area increases the volume of the motor, and in a design that emphasizes miniaturization of the product, the coil bundle 2b is extended due to dimensional restrictions to reduce the cooling surface area. There was a limit to measures to increase.

SUMMARY OF THE INVENTION It is an object of the present invention to eliminate the above-mentioned disadvantages of the prior art, increase the heat radiation surface area of the coil bundle without increasing the number of parts and without substantially changing the shape of the coil bundle, and improve the heat radiation performance of the stator coil. It is to improve.

[0006]

An object of the present invention is to divide at least one of coil end portions projecting as a bundle from a stator core into at least two portions in a radial direction, and to divide the coil end portions between the divided coil end portions. This is achieved by providing a space through which the cooling air passes.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to FIGS. 1 and 2 showing one embodiment. The coil bundle 2b formed by the coil end portion 2a protruding outward in the axial direction from both ends in the axial direction of the stator core 1 of the coil 2 is divided into two or more pieces in the radial direction at a substantially central portion in the circumferential direction and divided. A feature of the present invention is that a space 5 of about 2 to 3 mm is provided between the coil bundles 2b in the radial direction. The space 5 is formed by passing a tool made of plastic, for example, between the single coil bundles 2b so as not to damage the magnet wires constituting the stator coil 2, and is impregnated with a varnish or the like. The shape of the space 5 is fixed. A coil bundle 2b formed by the coil end portion 2a
Is formed by winding magnet wires so as to be stacked in substantially constant directions in the axial direction and the radial direction, respectively, and is wound so that the number of stages of the magnet wire in the axial direction is greater than the number of steps of the magnet wire in the radial direction. According to the above embodiment, the provision of the space 5 between the coil bundles 2b allows the cooling air to pass through the space 5,
The coil end portion 2a and, consequently, the stator coil 2 are efficiently cooled, and the temperature rise of the stator coil 2 is suppressed.

FIGS. 3 and 4a show another embodiment of the present invention, in which the lead wire 3 is located in a space 5 and the lead wire 3 is used as a spacer.
As a result, the space 5 is maintained, and there is no possibility that the space 5 will be blocked by any external force.
Will surely be cooled. In the case of this embodiment, the lead wire 3 cannot be located in the space 5 of the coil end portion 2a on the far side in FIG.
It is necessary to provide some kind of spacer made of an insulating material instead of.

In the above-described embodiment, the space 5 is provided on both the coil end portions 2a protruding from both ends in the axial direction of the stator core 1. However, the space 5 may be provided only on one coil end portion 2a. In this case, it is desirable to provide it on the windward side of the cooling air having a large cooling effect. Alternatively, a magnet wire having a heat-fusible coating may be used as the magnet wire, and after forming the space 5 as in the above embodiment, the shape of the space 5 may be fixed by heating the magnet wire.

[0010]

As described above, according to the present invention, since a space is provided in the coil end portion, the surface of the coil bundle divided by the space becomes a cooling heat radiating surface, and the cooling heat radiating surface area of the stator coil is increased and fixed. The child coil can be cooled well. In addition, the extremely simple structure of dividing the coil bundle at the coil end portion makes it possible to provide a low-cost and effective stator without significantly changing the manufacturing process.

[Brief description of the drawings]

FIG. 1 is a partially sectional front view showing an embodiment of a stator according to the present invention.

FIG. 2 is a sectional view taken along line AA of FIG.

FIG. 3 is a partial cross-sectional front view showing another embodiment of the stator of the present invention.

FIG. 4 is a partial cross-sectional top view of FIG. 3;

FIG. 5 is a partial cross-sectional front view showing an example of a conventional stator.

FIG. 6 is a sectional view taken along line BB of FIG. 5;

[Explanation of symbols]

1 is a stator core, 2 is a stator coil, 2a is a coil end portion, 2b is a coil bundle, 3 is a lead wire, 4 is an armature,
5 is space.

Claims (3)

[Claims] 1. A stator for a commutator motor comprising a stator core and a stator coil having a coil end portion wound around a slot of the stator core and projecting as a bundle from both ends of the stator core. Wherein at least one of the coil end portions protruding from the stator core is divided into at least two along the radial direction, and a space through which the cooling air passes is provided between the divided coil end portions. And the stator of the commutator motor. 2. The device according to claim 1, wherein a lead wire is located in the space to maintain the space.
The stator of the commutator motor as described. 3. The commutator motor stator according to claim 1, wherein the coil end portion provided with the space is located on the windward side of the cooling air.